noun
a person who is especially competent to pass critical judgments in an art, particularly one of the fine arts, or in matters of taste
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As a connoisseur of fine art, she could easily distinguish between a genuine masterpiece and a mere imitation.
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He's a real connoisseur when it comes to coffee, always seeking out the best roasts and blends.
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That guy fancies himself a beer connoisseur, but really he just drinks whatever's trendy.
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She's a connoisseur of human behavior, able to read people like a book after just a few minutes of interaction.